Air-heating apparatus for drying-rooms



(No Model.)

J. MoGANN.

AIR HEATING APPARATUS FOR DRYING ROOMS.

No. 341,591. Patented May 11,: 1886.

N. PETERS. PhMo-Lilhognphur, Washington, D c

UNITED STATES PATENT OFFICE.

JOHN MOCANN, OF JERSEY CITY, NE\V JERSEY.

AIR-HEATING APPARATUS FOR DRYING-ROOMS.

BPECIFICATION forming part of Letters Patent No. 341,591, dated May 11 1886.

Application filed July 13, 1885. Serial No. 171,450. (No model.)

To aZZ whom it may concern.-

'Be it known that I, J OHN hICOANN, of J ersey City, in the county of Hudson and State of New Jersey, haveinvented an improvement in Air-Heating Apparatus for Drying-Rooms, of which the following is a specification.

In planing-mills it is usual to provide a drying-room for the lumber and to heat the same by steam; but'where the exhaust-steam from the engine is used for this purpose there is a loss of power by backpressure upon the engine.

My improvement is made for preventing back-pressure upon the engine, for obtaining as high a temperature as possible from the exhaust-steam, and for adding to the tempera ture thus obtained the heat of live steam, thereby using only sufficient live steam to bring up the atmosphere that has become highly heated by the exhaust-steam to the temperature of the live steam, or nearly so.

In the drawings, Figure l is a vertical section of the apparatus complete. Fig. 2 is a sectional plan of the groups of tubes at war, Fig. 1; and Fig. 3 is a section of the upper end of one of the vertical exhaust-steam tubes.

The exhauststeam from the engine isled by the pipe A into the hollow castiron base B,

ond pipe, 0, leads to any chimney or free outlet; but as this pipe 0 is below the upper end of the pipeA the steam tends to pass first into the ranges of vertical pipes D that are screwed into the baseB and are open at their lower ends.

In radiators having vertical pipes the air is likely to remain in such pipes and prevent the steam passing freely into the same, and it is difficult to connect the upper ends of the ranges of pipes without interfering with the free circulation of the atmosphere. To prevent this difficulty, I provide a screw-cap, d, for the upper end of each tube D, and into such cap is inserted the lower end of a thin metallic pipe, I, preferably of soft copper or brass, the extreme lower end being swelled out into the cap to make a tight joint. These pipes I are drawn toward one common point or massed together in one or more groups, and preferably bent off horizontally and entered into the flue or escape-pipe K, so that the steam or steam and air that rises and passes off through the tubes I insures the constant change of the fluids within the pipes D, and the highest heat possible is obtained from the exhauststeam, and there is no possibility of backpressure, because a free escape is constantly open for the steam and a constant gradual circulation is maintained through the steampipes by the small vent to each through the small tube at the upper end. By this device the circulation is rendered more reliable and uniform than can be effected when cocks or valves are used. There is a case, L, around this radiator, and atmospheric air is forced into the same, preferably from the top at S, so as to become heated as it passes down among the tubes, andis led away from the bottom by the trunk M, that passes into the dryingroom or other place to be heated, as usual; but in the trunk M is an enlargement, forming a case, N, within which are ranges of pipes that may be connected together by bends and elbows, but preferably by top and bottom hollow boxes with vertical pipes to form a coil that is adapted to withstand the boiler-pressure, so that steam may be passed through the same directly from the boiler and give to thepipes a sufficiently high temperature to bring the air that is already hot up to nearly the temperature of the live steam. This renders the heat of the drying or other roomvery efficient, and although this improvement is especially adapted to heating a drying-room forlumber it may be applied in heating any chamber or room.

I prefer to pass through the hollow base B the vertical pipes 1', that are open at both ends and serve for the passage of atmospheric air as it is forced down among the pipes D.

By my improvement all elbows and bends are dispensed with, there is no risk of water remaining in the apparatus, and freezing and bursting the pi pcs or fitting.

Any desired number of pipes can be introduced into this radiator,according to the volume of air to be heated, and this apparatus produces no back-pressure upon the engine, even when only a small apparatus is employed, because the surplus steam has a free escape.

The cost of constructing this apparatus is small, and any tube that is defective can be removed with facility, the tubes in the middle portions being the longest,to allow them to be easily grasped by a wrench and unscrewed.

1 claim as my invention 1. The combinatiomwith the base and steaminlet pipe and vertical ranges of steamradiat ing pipes, of caps to such pipes and small venttubes grouped together, and a common vent or discharge tube or tubes, substantially as set forth.

2. The combination, with the hollow base and the exhauststeam pipe passing into the same, of the vertical range of radiating-pipes. a discharge-pipe, small vent-tubes connected with the upper ends of such pipes and passing to said discharge-tube, and a second pipe forming an escape from the hollow base for surplus steam, substantially as set forth.

3. The combinatiomwith the steam-pipe, the hollow base, and the vertical ranges of 1a JOHN MOCANN.

Vitnesses:

F. B. GHIDESTER, W'ILLIAM A. BYERs. 

